At 01:44 PM 7/26/01 +0200, you wrote: >Hmm, I'm only a PIC hobbyist, but I would never use a programming tool (HVP, >LVP, bootloader) that does not at least read back the programmed data at the >nominal Vcc (preferrably at other Vcc's too!). The flash-writing itself >could go wrong, so you might end up with a PIC that has a partially 'random' >program. I hope you don't do nuclear, avionics, medics etc? This one can check its own program so that is a possibility. It would catch bits that go bad gradually in the field as well as programming problems. Just do a checksum or (preferably) a CRC. Best regards, =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Spehro Pefhany --"it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com Contributions invited->The AVR-gcc FAQ is at: http://www.bluecollarlinux.com =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads